Question about 2000 Porsche Boxster

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2000 Boxster with tiptronic and 80k miles. High pitch squeal.

There is a high pitched squeal coming from the engine. Sounds like its in the front, and it sounds like metal to metal or a bad bearing. It only does it after being completely warmed up, or driving 10-15m. It only does it on deceleration. As soon as I touch the gas it goes away. Its really loud and annoying. My mechanic and myself thought it might be an idler, tensioner, or water pump. After 2 trips to the rack we could find nothing. Everything is tight, spins freely and shows no sign of damage. I posted on another site and someone suggested that when it started squealing to open the oil fill cap. If it went away I had a bad AOS or air oil seperator valve. I tried but the oil cap was sucked down so tightly I could not get it off. I pulled the dip stick and it was sucking air badly. I have since replaced the AOS valve and the Oxygen sensors (had a TC for it) and it still squeals. Once in a long while the oil warning light will flicker while this is going on. I am beginning to believe its a vaccum or crankcase ventilation problem of some sort, but I swear it sounds just like a metal to metal squeal. I don't have a clue what to look for next. As soon as it sees the rack it quits squealing. Help, I going nuts here !!!

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Hi and welcome to FixYa,

If it were a belt, then it would be a squeak and would be apparent on accelerating. Your description indicates 'metal to metal' and on deceleration. While it is also possible to be a faulty AOS (I guess we still call them PCV), it would be a high pitched whistle since that would be air coming into the engine because of the vacuum as you described.

I think you would not describe it as 'metal to metal' if it were not. Since you have checked most, check the hidden. There would be a the big bolt that holds the drive pulley for the power steering to the end of the c-shaft. You may need to check/tighten. To my understanding, the cover to the belt housing has to be removed initially.

Good luck and thank you for using FixYa.

Posted on Feb 25, 2009

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  • Master
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You may have a worn drive belt or faulty alternator. A more rare occurrence could be a bad power steering pump.

  • You may be able to temporarily fix the problem by spraying WD-40 on the underside of the drive belt (locate it via your owner's manual) and on the exposed bearings of the alternator. Otherwise, have a mechanic investigate these possibilities and have only the necessary parts replaced.

Posted on Feb 25, 2009

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